/* eslint-disable */
let idTmr;
const getExplorer = () => {
  let explorer = window.navigator.userAgent;
  //ie
  if (explorer.indexOf("MSIE") >= 0) {
    return 'ie';
  }
  //firefox

  else if (explorer.indexOf("Firefox") >= 0) {
    return 'Firefox';
  }
  //Chrome
  else if (explorer.indexOf("Chrome") >= 0) {
    return 'Chrome';
  }
  //Opera
  else if (explorer.indexOf("Opera") >= 0) {
    return 'Opera';
  }
  //Safari
  else if (explorer.indexOf("Safari") >= 0) {
    return 'Safari';
  }
}
// 判断浏览器是否为IE
const exportToExcel = (data, name) => {

  // 判断是否为IE
  if (getExplorer() == 'ie') {
    tableToIE(data, name)
  } else {
    tableToNotIE(data, name)
  }
}

const Cleanup = () => {
  window.clearInterval(idTmr);
}

// ie浏览器下执行
const tableToIE = (data, name) => {
  let curTbl = data;
  let oXL = new ActiveXObject("Excel.Application");

  //创建AX对象excel
  let oWB = oXL.Workbooks.Add();
  //获取workbook对象
  let xlsheet = oWB.Worksheets(1);
  //激活当前sheet
  let sel = document.body.createTextRange();
  sel.moveToElementText(curTbl);
  //把表格中的内容移到TextRange中
  sel.select;
  //全选TextRange中内容
  sel.execCommand("Copy");
  //复制TextRange中内容
  xlsheet.Paste();
  //粘贴到活动的EXCEL中

  oXL.Visible = true;
  //设置excel可见属性

  try {
    let fname = oXL.Application.GetSaveAsFilename("Excel.xls", "Excel Spreadsheets (*.xls), *.xls");
  } catch (e) {
    print("Nested catch caught " + e);
  } finally {
    oWB.SaveAs(fname);

    oWB.Close(savechanges = false);
    //xls.visible = false;
    oXL.Quit();
    oXL = null;
    // 结束excel进程，退出完成
    window.setInterval("Cleanup();", 1);
    idTmr = window.setInterval("Cleanup();", 1);
  }
}

// 非ie浏览器下执行
const tableToNotIE = (function () {
  // 编码要用utf-8不然默认gbk会出现中文乱码
  const uri = 'data:application/vnd.ms-excel;base64,',
    template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><meta charset="UTF-8"><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>';

  const base64 = function (s) {
    return window.btoa(unescape(encodeURIComponent(s)));
  }

  const format = (s, c) => {
    return s.replace(/{(\w+)}/g,
      (m, p) => {
        return c[p];
      })
  }

  return (table, name) => {
    const ctx = {
      worksheet: name,
      table
    }

    const url = uri + base64(format(template, ctx));

    if (navigator.userAgent.indexOf("Firefox") > -1) {
      window.location.href = url
    } else {
      const aLink = document.createElement('a');
      aLink.href = url;
      aLink.download = name || '';
      let event;
      if (window.MouseEvent) {
        event = new MouseEvent('click');
      } else {
        event = document.createEvent('MouseEvents');
        event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
      }
      aLink.dispatchEvent(event);
    }
  }
})()

// 导出函数
const table2excel = (column, data, excelName) => {
  const typeMap = {
    image: getImageHtml,
    text: getTextHtml
  }

  let thead = column.reduce((result, item) => {
    result += `<th>${item.title}</th>`
    return result
  }, '')

  thead = `<thead><tr>${thead}</tr></thead>`

  let tbody = data.reduce((result, row) => {
    const temp = column.reduce((tds, col) => {
      tds += typeMap[col.type || 'text'](row[col.key], col)
      return tds
    }, '')
    result += `<tr>${temp}</tr>`
    return result
  }, '')

  tbody = `<tbody>${tbody}</tbody>`

  const table = thead + tbody

  // 导出表格
  exportToExcel(table, excelName)

  function getTextHtml(val) {
    // return `<td style="text-align: center">${val}</td>`
    return `<td style="text-align: center;mso-number-format: '\\@'">${val}</td>`
  }

  function getImageHtml(val, options) {
    options = Object.assign({width: 40, height: 60}, options)
    return `<td style="width: ${options.width}px; height: ${options.height}px; text-align: center; vertical-align: middle"><img src="${val}" width=${options.width} height=${options.height}></td>`
  }
}

export default table2excel
